Synthesis and structural characterisation of lithium, zinc, and aluminium pyrazolate complexes

Rad, Nazli E., Junk, Peter C., Deacon, Glen B., Taidakov, Ilya V., and Wang, Jun (2020) Synthesis and structural characterisation of lithium, zinc, and aluminium pyrazolate complexes. Australian Journal of Chemistry, 73 (6). pp. 520-528.

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The reaction of nBuLi with 3,5-dimethylpyrazole (Me(2)pzH) in Et2O or tmeda/hexane (tmeda=N,N,N ',N '-tetramethylethane-1,2-diamine) and with 3,5-dimethyl-4-nitropyrazolate (Me(2)pzHNO(2)) in THF results in the formation of three structurally diverse lithium pyrazolates: namely an Et2O-solvated tetrameric complex [Li-4(Me(2)pz)(4)(OEt2)(4)], bridged entirely with mu-eta(2):eta(1)-pyrazolate bonding, a hexanuclear complex [Li-6(Me(2)pz)(6)(tmeda)(2)] with four different coordination modes (mu-eta(1):eta(1), mu-eta(2):eta(1), mu(3)-eta(1):eta(2):eta(1) and mu(3)-eta(2):eta(2):eta(1)), and a new polymeric compound [Li-2(Me(2)pzNO(2))(2)(thf)(2)](n), with [Li-2(Me(2)pzNO(2))(2)(thf)(2)] groups linked by -NO2 coordination. A mononuclear zinc complex [Zn(tBu(2)pz)(2)(tBu(2)pzH)(2)].1/2THF (tBu(2)pzH=3,5-di-tert-butylpyrazole) was prepared by reaction of tBu(2)pzH with ZnEt2, unidentate tBu(2)pz groups being stabilised by N-HN hydrogen bonding. Treatment of 3,5-diphenylpyrazole (Ph(2)pzH) with trimethylaluminium (mole ratio 3:1) in THF led to the formation of dinuclear [AlMe2(mu-Ph(2)pz)](2).1/2THF.

Item ID: 64695
Item Type: Article (Research - C1)
ISSN: 1445-0038
Keywords: lithium, structurally varied, chemistry, polymeric compound
Copyright Information: Journal compilation © CSIRO 2020
Funders: Australian Research Council (ARC), Russian Science Foundation (RSF)
Projects and Grants: ARC Discovery Grant number DP160101640, ARC Discovery Grant number DP190100798, RSF Project Number 19–13–00272
Date Deposited: 21 Oct 2020 08:02
FoR Codes: 34 CHEMICAL SCIENCES > 3405 Organic chemistry > 340503 Organic chemical synthesis @ 100%
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